更新cocoaPods

查看版本：

BeijingHCdeMacBook-Pro:~ chen$ pod --version

0.39.0

查看镜像源

BeijingHCdeMacBook-Pro:~ chen$ gem sources -l

*** CURRENT SOURCES ***

https://ruby.taobao.org/

更新步骤：

更新gem,切换https

BeijingHCdeMacBook-Pro:~ chen$  gem source  -remove http://ruby.taobao.org/

BeijingHCdeMacBook-Pro:~ chen$  gem source -a https://ruby.taobao.org/

安装cocoapods

BeijingHCdeMacBook-Pro:~ chen$ sudo gem install cocoapods

BeijingHCdeMacBook-Pro:~ chen$ pod setup